Iran has two known underground nuclear enrichment sites, the one Israel attacked on the first day of its assault at Natanz, and another at Fordo. Both sit south of Tehran in central Iran, but Fordo has long been the Iranian nuclear facility of most concern to international monitors and experts.

Israel's military said Monday it had carried out its most extensive barrage of missile attacks yet on Tehran, as well as new strikes on roads leading to the Fordo nuclear site.